Air sensitive samples for EI analysis need to be supplied in special sealed capillaries. Please see the Facility personnel to obtain these. Sample requirements for air sensitive EI analysis are the same as for regular EI samples: between 50 micrograms (ug) and 1 mg. Air sensitive samples can sometimes be analyzed by electrospray ionization (ESI). Here, sample preparation and instrument setup are critical for the success of the analysis. Please contact Dr. Ulla Andersen (email: norklit AT berkeley DOT edu) if you need to analyze an air sensitive sample by ESI.